我們研究調查在週期光柵金屬下，內嵌入腔造成共振頻率的穿遂，一個內嵌入的長方腔會影響其穿透頻率，其模態為波導模態和耦合模態。在耦合模態中，分別有其一為穿透外部溝槽和內部腔，形成整個結構共振，另其一為純內部腔自己共振。在波導模態中，穿透頻率非常靠近表面光柵的吸收頻率，而跟腔共振形成差異。
在內嵌入十字腔下，發現四個模態產生，穿透頻率可分為與上下長度有關和左右長度有關，都與結構長度有關，而與表面光柵的吸收有所區別，
如果我們在此利用連串十字架來設計中光學共振腔，並在其中嵌入增益性介質，達到尺寸奈米化。
並且也可以利用其頻譜對於介質的敏感度來設計出生物感測器。

We investigate cavity-modulated resonant tunneling through a silver film with periodic grooves on both surfaces.
A strip cavity embedded in the film affects tunneling frequencies via a coupling mode and waveguide mode. In the coupling mode, both the resonant tunneling through the gap between the groove and the cavity and the cavity itself form an entire resonant structure.
In the waveguide mode, however, the cavity functions as a surface-plasmon waveguide. Hence, tunneling frequencies are close to resonant absorption frequencies of the groove structure and are irrelevant to cavity properties.
A cross cavity embedded in the film affects tunneling frequencies via coupling mode. In the coupling mode, frequency functions as a embedded cavity length.
We can use the advantages to design the nano-device to detect the characteristics of test objects.

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